add missing model dir (#22)

Author: leoglonz

ngen_resources/data/_dhbv_2/model/README.md

@@ -0,0 +1,7 @@
+# Model
+
+See `docs/1-module_setup.md` for instructions on installing critical model components:
+
+- `dhbv_2.pt` neural network model weights;
+- `normalization_statistics.json` stats for neural network input data normalization;
+- `config.yaml` model configuration.

ngen_resources/data/dhbv_2_mts/model/README.md

@@ -0,0 +1,7 @@
+# Model
+
+See `docs/1-module_setup.md` for instructions on installing critical model components:
+
+- `dhbv_2_mts.pt` neural network model weights;
+- `normalization_statistics.json` stats for neural network input data normalization;
+- `config.yaml` model configuration.